25Hz - 0
50Hz - 0
Phase - 180, since it is located in the back of the room
Low Pass Filter - doesn't matter since you are likely using the LFE input and it is bypassed, but I would still set as high as possible like Erik said.
High Pass Filter Out - also doesn't matter, so just set it to none.
Now run the auto setup in the receiver using the microphone as Erik suggested.
50Hz - 0
Phase - 180, since it is located in the back of the room
Low Pass Filter - doesn't matter since you are likely using the LFE input and it is bypassed, but I would still set as high as possible like Erik said.
High Pass Filter Out - also doesn't matter, so just set it to none.
Now run the auto setup in the receiver using the microphone as Erik suggested.